That backtrace isn't correct for the current el6 code of python-bugzilla. There is no getProdInfo() call in bugzilla/__init__.py I'm guessing you have an older stale version manually installed or something like that.
Please 'yum remove python-bugzilla', then keep doing:
python -c 'import bugzilla; print bugzilla'
and deleting/moving whatever directories it references until the import no longer works, reinstall python-bugzilla and try again.
If you can still reproduce after that then please reopen.

Ah, now I see whats happened....
What used to be one machine sts has been duplicated to be two machines (sts-a and sts-b) and my crontab has been copied to both somehow or other. sts-b had the old copy of the python-bugzilla package (now updated) and the other machine was not sending me the output from the cronjob, but did have the newer package.
Sorry about that - at least I've figured out whats going on now. Just need to figure out why sts-a wasn't executing the script and I should be up and running again.

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